I don't think so but what you an do is get a Google voice number and link that one to your Viber. Viber will send a verification message to that Google Voice number. I don't think Viber will work
Yes, internet is required for Viber. Viber makes calls and sends messages through the internet so you either got to have a Wi-Fi connection or a data connection (preferably 4g or LTE). Viber is
You can make international calls and receive them on Viber as long as you and the person your calling both have Viber. I believe international calls are free on Viber because it is VOIP through the Viber
Let's compare Skype and Viber.
Both are P2P, Viber is beginning while skype is a mature product. Skype signaling and codec are both proven as super scalable. VIber supports push message while skype
People are wondering how Viber makes money. One of the way to make money for Viber is to provide cheap viber to phone calls and also normal phones to viber calls .
Below is what Viber had to say
In order to use the Viber app, you must enable Push Notifications for Viber.
What are Push Notifications?
Push notifications allow Viber to notify you of any calls (incoming, missed, etc.)
To go offline in Viber, you can go to Viber's More tab --> Settings --> and disable "Display my online status".
However, note that once this option is turned off, you will also not be able to